Introduction of bumper mold

With the development of the automobile industry, the automobile bumper, as an important safety device, has also moved towards the road of innovation. In addition to maintaining the original protective function, the front and rear bumpers of today's cars should also pursue harmony and unity with the body shape, and pursue their own lightweight. In order to achieve this purpose, the front and rear bumpers of cars are currently made of plastic, which are called plastic bumpers.

The bumper mould material requires good rigidity in a wide temperature range, good impact resistance, good dimensional stability, good solvent resistance, and good coating performance. Commonly used>PP+EPDM-T20.

The bumper is composed of a buffer beam, (energy absorber) energy-absorbing foam, a body and a connecting bracket, and the energy absorber is in the form of PP foam. The bumper body, upper and lower grilles, tow hook cover, and lower support guard plate are made of PP+EPDM-T20: PP is the base of the bumper cover, EPDM can improve the elasticity of the bumper cover, and T20 means the material Plus 20% talc, mainly to increase the stiffness of the bumper cover.

The energy-absorbing block generally adopts EPP or PP foam structure, which plays the role of absorbing impact energy. The front/rear bumper beam body material adopts cold-rolled high-strength structural steel B340/590DP, and the buffer beam bracket adopts B180P2 (relative to the beam body material, this material has lower strength, but the price is cheap), mainly to meet the requirements of European regulations. Front/rear crash requirements.

The parting line is visible on the bumper formed by the outer parting injection molding, such as the parting line where the bumper and wheel cover, hood, fender, and side wall meet. The outer parting structure has no parting line inversion in the demoulding direction of the plastic part. In the whole vehicle state, the parting line of the bumper is exposed on the outer surface of the car, which will affect the appearance quality of the car.

The front bumper has an obvious parting line near the fender and wheel cover, even forming a step, and the parting line here is difficult to cover with paint later, which not only affects the appearance quality of the bumper, but also affects Appearance of the vehicle. The outer parting line of the rear bumper is mainly reflected in the position where it cooperates with the side walls and wheel covers.